<template>
  <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" @keyup.enter="addTodo"/>
      </div>
</template>

<script>
// 需要解构出来
import {nanoid} from 'nanoid'
  export default {
    name:'Header',
    props:['todos'],
    methods:{
        addTodo(event){
            let val = event.target.value;
            if(!val.trim()) return alert('不能输入空值,请输入内容');
            let newObj = {id:nanoid(),title:val,done:false};
           const result = this.$emit('addTodos',newObj);
           if(result) event.target.value ="";
        }
    }
  }
</script>

<style scoped>
  /*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>